The St. Michael Archangel Prayer is a powerful invocation that calls upon St. Michael, a leader of the heavenly armies, to defend humanity against evil and spiritual harm. Originally written by Pope Leo XIII in 1886 after a profound vision of spiritual warfare, it was included in the prayers said at the end of Low Mass in the Roman Catholic Church until 1964. The prayer is widely used today for personal protection, particularly in moments of temptation or spiritual struggle, and is considered an important tool in spiritual warfare. Its enduring significance lies in its appeal to St. Michael to “defend us in battle,” underscoring his role as a protector against the forces of darkness.